Electrical Engineering MCQs on Power System Protection
Contents
- 1 The medium used for extinction of arc in air circuit breaker
- 2 A transmission line is protected by
- 3 The contacts of high voltage switches used in power system are submerged in oil. The key purpose of the oil is to
- 4 Circuit breakers are basically
- 5 Ungrounded neutral transmission system is not recommended, that is, since the system
The medium used for extinction of arc in air circuit breaker
The medium used for the extinction of arc in air circuit breaker
- Air
- Oil
- SF6
- Water
Correct answer: 1. Air
A transmission line is protected by
A transmission line is protected by
- Distance protection
- Time graded and current graded over current protection
- Both of these
- None of these
Correct answer: 3. Both of these
Also see working of Distance relays here
The contacts of high voltage switches used in power system are submerged in oil. The key purpose of the oil is to
The contacts of high voltage switches used in power system are submerged in oil. The key purpose of the oil is to
- Extinguish the arc
- Insulate the contacts from switch body
- Lubricate the contacts
- All of these
Correct answer: 1. Extinguish the arc
Circuit breakers are basically
Circuit breakers are basically
- Arc extinguishers
- Circuits to break the system
- Current carrying contacts called electrodes
- Transformers to isolate the two systems
Correct answer: 3. Current carrying contacts called electrodes
Also see: Breaking capacity of SF6 circuit breaker is not affected by
Ungrounded neutral transmission system is not recommended, that is, since the system
Ungrounded neutral transmission system is not recommended, that is, since the system
- Being inadequately protected against ground fault
- Insulation being overstressed due to over voltages
- Insulation overstress may lead to failure and subsequent phase to phase faults
- All of these
Correct answer: 4. All of these